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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes [Line Items] |  |  |
Release of Valuation Allowance |  | $ 174,500,000 |
Valuation Allowance | 1,600,000 | 3,300,000 |
Reduction of recorded value of the Company's state net deferred tax asset | 3,400,000 |  |
Deferred tax assets related to net operating losses for federal income tax purposes | 49,001,000 | 63,886,000 |
Deferred tax assets related to net capital losses for federal income tax purposes | 1,122,000 | 1,760,000 |
Future tax return benefits | 14,200,000 |  |
Deferred tax assets previously reported | 108,713,000 | 136,829,000 | 93,000,000
Deferred tax assets relating to net operating losses and intangible assets |  |  | 89,000,000
Internal Revenue |  |  | 4,000,000
Gross deferred tax assets and related offsetting valuation allowance |  | 31,800,000 |
Unrecognized tax benefit related to uncertain tax position | 31,800,000 |  |
Unrecognized tax benefits | 31,800,000 |  |
Unrecognized tax benefits, maturity period | 12 months |  |
Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred tax assets related to net operating losses for federal income tax purposes | 39,700,000 |  |
Deferred tax assets related to net capital losses for federal income tax purposes | 300,000 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred tax assets related to net operating losses for federal income tax purposes | 9,300,000 |  |
Deferred tax assets related to net capital losses for federal income tax purposes | $ 800,000 |  |

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